Again, there is no hard and fast rule. It can be a part of your comprehensive Instagram strategy, personal target, etc. Still, to play safe, you can start by infusing smaller numbers. It is more relevant for newly opened accounts. A sudden jump in any of these metrics can attract negative attention. People can discredit your account even if they find your content to be impressive. It happens because everyone is used to seeing such growth only on celebrity pages, big brands, and well-known business accounts. It is pretty understandable also. However, a debutant without any background suddenly getting too high followers, views, and comments can be challenging to digest.
So, drip feed your account from time to time to give it a push in a desirable direction. As such, there isn’t any periodic cycle when you can expect your activity to yield the best results. But you can determine your choice based on the organic flow. If numbers are too low or modest, you can buy Instagram services at a closer gap. However, when your account starts doing well, the time gap would increase. So you can afford to wait longer to add new numbers.